As the range of the non-line-of-sight (NLOS) ultraviolet (UV) communication increases, atmospheric turbulence will become one of the primary atmospheric processes that affect the propagation of optical waves besides atmospheric absorption and scattering. This paper analyzes scintillation attenuation (SA), indicating that it should not be ignored for long communication range and relatively strong turbulence. A turbulence model considering SA is proposed, and the marginal probability density function (PDF) of the received optical power is derived. Then, the signal-to-noise ratio (SNR) and the bit-error-rate (BER) of NLOS UV communication systems are analyzed, showing that atmospheric turbulence induces greater performance deteriorations due to SA.

As grid computing continues to gain popularity in the industry and research community, it also attracts more attention from the customer level. The large number of users and high frequency of job requests in the consumer market make this scenario a challenge for grid computing. Clearly, all the current client/server(C/S)-based architectures will become unfeasible for supporting large-scale grid applications due to their poor scalability and poor fault-tolerance. In order to address this issue, a novel C/S and peer-to-peer hybrid architecture to realise a highly scalable and flexible platform for optical grid is proposed here. The anycast algorithms, which are used to search suitable resources for job requests in this hybrid architecture, are also investigated in detail. Simulation and experimental results show that the proposed architecture is suitable and efficient for grid applications, and it outperforms C/S-based architecture in a large-scale grid environment.